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Piron no Himitsu
ピロンの秘密 · ぴろん の ひみつ
est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
Brothers Tetsuo and Akio, who were camping in the mountains, meet a mysterious boy named Piron. Piron is actually the prince of the star Castor in the Gemini constellation. His father was displaced from power by minister Valles, and Piron escaped to Earth with Mira, his robot companion. Tetsuo and Akio, along with Mira, decide to help and protect Piron from Valles' assassins, who are sent to Earth after him.
Source: AniList
External databases: MADB · AniList · Wikidata
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections
Volumes
手塚治虫漫画全集 Complete works First edition
1vols · 1993-07
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Astro Boy
鉄腕アトム
1956 · 浦沢直樹, スタジオナッツ, 手塚治虫 · 273vols · Seinen
Sci-FiActionAdventureCyberpunkSuspense
Black Jack
ブラック・ジャック
1974 · 手塚治虫, 吉富昭仁, 山本賢治 · 207vols · Shōnen
DramaMedicalGhostsTragedyWar
Phoenix: Early Works
火の鳥
1968 · 手塚治虫 · 179vols · Shōnen
Sci-FiAdventureCyberpunkDystopianDrama
The Three-Eyed One
三つ目がとおる
1975 · 手塚治虫 · 99vols · Shōnen
Sci-FiAdventureDramaPsychic PowersSupernatural
Buddha
ブッダ
1974 · 手塚治虫 · 78vols · Shōnen
AdventureComedyDramaPsychologicalTragedy
Hidamari no Ki
陽だまりの樹
1983 · 手塚治虫 · 68vols · Seinen
ActionDramaSamuraiMedicalSlice of Life
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Shin Gin no Chimera
新・銀のキメイラ
1993 · 中村地里 · 2vols
Sci-FiActionRomance
Darkside Blues
ダークサイド・ブルース
1993 · あしべゆうほ, 菊地秀行, 菊池秀行 · 5vols
Sci-FiActionDystopianFantasy
DAI-HONYA
DAI‐HONYA
1993 · とり・みき, 田北鑑生 · 1vols
Sci-FiActionComedy
Blue Sonnet
紅い牙
1993 · 柴田昌弘 · 19vols
Sci-FiActionAdventurePsychic PowersSupernatural
Gakuen Teikoku: Ore wa Jūbei!
学園帝国俺はジュウベイ!
1993 · 中平正彦, 広井王子 · 4vols · Shōnen
Sci-FiActionComedyDelinquentsCrossdressing
Mama wa Shōgaku 4 Nensei
ママは小学4年生
1993 · 中森衣都 · 2vols · Shōjo
Sci-FiComedyTime TravelDramaFantasy